Investigation of the performance of e-CPA for a wide range of properties for aqueous NaCl solutions

Olsen, Martin Due; Kontogeorgis, Georgios M.; Solms, Nicolas von

doi:10.1016/j.fluid.2021.113167

Cited by 18 publications

(34 citation statements)

References 46 publications

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“…In ref. [55] is also reported that densities are now much better represented at higher temperatures and molalities and we also show here, in figure 11, that the new approach (with densities included in the parameter estimation) yields also much better densities at high pressures as well (compare sets 4 and 5 to previous sets 1-3 based on translation).…”

Section: Using Density In the Parameter Estimationsupporting

confidence: 73%

“…This is a rather "artificial" way of representing density data and indeed as shown in ref. 39 and also recently by Due Olsen et al [55] the representation of density of NaCl-water progressively becomes worse at higher molalities and temperatures.…”

Section: Using Density In the Parameter Estimationmentioning

confidence: 63%

“…In a recent study by Due Olsen et al [55], focusing only on NaCl-water, parameters are fitted to activity coefficients (mean ionic and osmotic) as well as density data. Using the same number of adjustable parameters (salt-specific for the energies) as in previous sets, it has been shown that all properties (activity coefficients, SLE, CO2 solubilities and densities) are represented as well or even better (e.g.…”

Section: Using Density In the Parameter Estimationmentioning

confidence: 99%

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A Review of Electrolyte Equations of State with Emphasis on Those Based on Cubic and Cubic-Plus-Association (CPA) Models

et al. 2022

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Section: Using Density In the Parameter Estimationsupporting

confidence: 73%

Section: Using Density In the Parameter Estimationmentioning

confidence: 63%

Section: Using Density In the Parameter Estimationmentioning

confidence: 99%

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A Review of Electrolyte Equations of State with Emphasis on Those Based on Cubic and Cubic-Plus-Association (CPA) Models

et al. 2022

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“…The need for a good representation of the phase equilibria of mixtures of gases with water or brine therefore requires modifications to the cubic equations of state, either by modifying some parameters (binary interaction coefficient Kij, cohesion parameter a, etc.) as in the Soreide and Whitson model [46] or by adding other terms to the equation of state to take into account the presence of water or saline water (CPA type models [47,48]).…”

Section: Equation Of State (Eos)mentioning

confidence: 99%

Thermodynamic Modeling of Mutual Solubilities in Gas-Laden Brines Systems Containing CO2, CH4, N2, O2, H2, H2O, NaCl, CaCl2, and KCl: Application to Degassing in Geothermal Processes

et al. 2021

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With the growing interest in geothermal energy as a renewable and sustainable energy source, nowadays engineers and researchers are facing technological and environmental challenges during geothermal wells’ operation or energy recovery improvement by optimizing surface installations. One of the major problems encountered is the degassing of geothermal brines which are often loaded with dissolved gases, resulting in technical problems (scale formation, corrosion, reduced process efficiency, etc.) and environmental problems through the possible emission of greenhouse gases (CO2, CH4 and water vapor) into the atmosphere. In this work, a method to predict, from readily available information such as temperature and GLR, the bubble point pressure of geothermal fluids as well as the GHG emission rate depending on the surface conditions is presented. This method is based on an extended version of the Soreide and Whitson model with new parameters optimized on the solubility data of several gases (CO2, CH4, N2, O2 and H2) in brine (NaCl + CaCl2 + KCl). The developed approach has been successfully used for the prediction of water content of different gases and their solubilities in different types of brines over a wide temperature and pressure range, and has been applied for the prediction of bubble point pressure and GHG emissions by comparing the results with available industrial data of geothermal power plants including the Upper Rhine Graben sites.

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“…One should expect large deviations when the density is not included in the objective function. 4,5 Therefore, density is an important property that has to be critically evaluated before it can be used in model development.…”

Section: List Of Tablesmentioning

confidence: 99%

Reference Density Database for 20 Aqueous Alkali Halide Solutions

Yang

Kontogeorgis

et al. 2022

Journal of Physical and Chemical Reference Data

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A reference density database of aqueous alkali halide solutions is presented. The solutes are the 20 alkali halides consisting of the cations Li+, Na+, K+, Rb+, Cs+, and anions F−, Cl−, Br−, I−. Experimental density data of these aqueous electrolyte solutions are extensively collected and critically evaluated. A data evaluation procedure is proposed, utilizing support vector regression (SVR) to compare the experimental datasets against each other. Data evaluation is based on agreement with data from other sources rather than accuracy claimed in the literature. Datasets with large deviation from others are identified and removed. The proposed reference database consists of 11 081 data points of 586 datasets from 309 references. Maximum deviations between the selected datasets do not exceed 1%, and are smaller than 0.5% for most of the aqueous alkali halide solutions. SVR models are also trained based on the reference database. Data distribution is visualized using a Gaussian mixture model. Applicability domains of the SVR models are analyzed using Williams plots. An executable program is provided for calculations based on the SVR models.

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Investigation of the performance of e-CPA for a wide range of properties for aqueous NaCl solutions

Cited by 18 publications

References 46 publications

A Review of Electrolyte Equations of State with Emphasis on Those Based on Cubic and Cubic-Plus-Association (CPA) Models

A Review of Electrolyte Equations of State with Emphasis on Those Based on Cubic and Cubic-Plus-Association (CPA) Models

Thermodynamic Modeling of Mutual Solubilities in Gas-Laden Brines Systems Containing CO2, CH4, N2, O2, H2, H2O, NaCl, CaCl2, and KCl: Application to Degassing in Geothermal Processes

Reference Density Database for 20 Aqueous Alkali Halide Solutions

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